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Mastering Multi Table Queries
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Mastering Multi Table Queries

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Questions and Answers

Which of the following is NOT a method for combining multiple datasets from different databases in multi-table queries?

  • VLOOKUP (correct)
  • Join
  • Subquery
  • Matching keys

    • What is the purpose of a subquery in multi-table queries?

  • To retrieve data from one table based on data from another table(s) (correct)
  • To retrieve data from multiple tables at the same time
  • To test a given condition using matching columns
  • To connect multiple queries using parentheses

    • What is the function of the JOIN operator in multi-table queries?

  • To test a given condition using matching columns
  • To retrieve data from one table based on data from another table(s)
  • To connect multiple queries using parentheses
  • To retrieve data from multiple tables at the same time (correct)

    • Which attribute(s) are used to organize and store business data?

    <p>Both business functions/regions and data confidentiality</p> Signup and view all the answers

    What is the purpose of the VLOOKUP function in MS Excel?

    <p>To retrieve data from one table based on data from another table(s)</p> Signup and view all the answers

    What is the main difference between IN and EXISTS in SQL?

    <p>IN scans all records fetched from the given subquery column, while EXISTS evaluates a Boolean statement</p> Signup and view all the answers

    When is the EXISTS clause typically used in a SQL query?

    <p>With WHERE clause</p> Signup and view all the answers

    What does the EXISTS clause return if the subquery returns any rows?

    <p>True</p> Signup and view all the answers

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